Trial hearing On 6 March 1978, Haw stood trial at the
High Court for murdering Phoon and Hu. Haw was represented by J S Khosa, while the prosecution was led by E C Foenander. The trial was presided by two judges -
Arumugam Ponnu Rajah (also known as A P Rajah) and Frederick Arthur Chua (蔡福海 Cài Fúhǎi; better known as F A Chua). During the trial itself, the trial court was told that before the day of the murders, Haw had been involved in arguments with both Phoon and his mother for not cleaning the tables properly, and the relationship between Haw and the Phoon family had not been cordial as a result of these misunderstandings and petty arguments. On the day of the murders itself, Haw was angered to see that Phoon dropped some duck bones on the ground while wiping one of the tables, and feeling incensed over this and another matter of Haw overhearing Phoon grumbling about Haw's daughter not cleaning a table well, Haw thus grabbed a hand scraper to stab Phoon on the chest once while Phoon was taking orders from two female customers. Hu, who rushed over to help her second son, had a scuffle with Haw, who stabbed her twice in the chest. This brutal attack caused both Hu and Phoon to die from the stabbing. Phoon's elder sister Kai Kiew, who witnessed the stabbing of her second brother and mother, tried to intervene, but Haw tried to attack and attempted to stab her, which was averted by Phoon's older brother Hon Sun, who rushed over and slashed Haw on the arm with a chopper, leading to Haw fleeing on a taxi to
Singapore General Hospital, where he was arrested while warded for treatment. One of the witnesses, Soh Poh Choo (苏宝珠 Sū Bǎozhū), who was the helper of Haw's hawker stall, said she tried to intervene but was hurt by Phoon's brother. A patron named Wong Moi Chin (黄梅珠 Huáng Méizhū), who was present with her friend Heng Siew Khim (王秀金 Wáng Xiùjīn), verified that Haw had directly approached Phoon and attacked him while Phoon was taking down both their orders, and a third patron Chan Seng Chong (陈盛昌 Chén Shèngchāng) witnessed Haw wielding a hand scraper at the time he murdered Hu and Phoon. In his defence, Haw maintained that he never intended to kill both Phoon and Hu. He testified that he was approaching Phoon with the intention of telling him to clean the table properly and sweep up the duck bones that dropped onto the floor. Haw said during the conversation, he was hit on the head and noticed Phoon was holding a chopper, and Hu was rushing behind her son with a chopper in her hand while heading in the direction of Haw. Haw said that he pushed the mother-son duo in self-defence during the fight, and he never noticed he had an object resembling a piece of wood on his head until he pushed the two victims down, and as a result, it caused the fatal injuries on both Phoon and Hu. Overall, Haw's defence was he had accidentally stabbed the victims to death, and that he was not aware that he had a weapon in his hand when he confronted Phoon over the table cleaning issue. Aside from this, several prosecution witnesses, including Phoon's stall assistant Leong Ah Kum (梁亚金 Liáng Yàjīn), customers and the Phoon family members, also verified earlier during the trial that they never saw the mother-son pair attacking Haw with choppers, which further raised doubts over the credibility of Haw's defence in court.
Death penalty On 17 March 1978, after a trial lasting ten days, the two trial judges - Justice A P Rajah and Justice F A Chua - delivered their verdict. In their judgement, the two judges found that Haw's defence of accidental stabbing and not knowing he was armed was untenable. The two judges agreed that both Phoon and Hu never attacked Haw, and it was Haw himself who confronted the mother-son pair and used the hand scraper to violent attack the two victims, and the story of the victims conducting a chopper attack on Haw was therefore not true. They agreed that Haw knew he was armed and he had intentionally used the scraper to inflict the bodily injuries, such that they were fatal and led to the deaths of Phoon Ah Leong and Hu Yuen Keng, and he also had the intent to cause their death when he committed the stabbing, which also proven he did not done so accidentally. The two judges therefore concluded that on these above grounds, it was sufficient to return with a guilty verdict of murder in Haw's case. As such, 37-year-old Haw Tua Tau was found
guilty of murder on two counts, and he was
sentenced to death by
hanging for each count of murder. Prior to 2013, Singaporean law prescribed the death penalty as the
mandatory sentence for all four degrees of murder under the
Penal Code. Haw's wife Chan Lee Kheng (陈丽卿 Chén Lìqìng), who was present in court, reportedly wept as the death sentence was pronounced on her husband. Haw was the first person to be sentenced to death in Singapore during the year of 1978 itself. ==Court of Appeal ruling==